Device for firmly attaching exchangeable blades to hoes, mattocks, or the like



Sept. 18, 1928. 1,684,849

- C. E. RUGGEBERG DEVICE FORFIRMLY ATTACHING EXCHANGEABLE BLADES 1'0 HOES, MATTOCKS. OR THE LIKE Filed March 9, 1928 Fig.1

{Mann I'nrenlor:

Patented Sept. 18, 1928.

' UNITED STATES PATENT OFFICE.

CARL EDUARD RIIGGEBERG, 0F REMSCHEIZD, GERMANY.

DEVICE FOR FIRMLY ATTACHING EXCHANGEABLE BLADES T0 HOES, MAITOCKS, OR

THE

Application filed March 9, 1928, Serial No.

This invention relates to a hoe or mattock, or similar implements, having a detachable or exchangeable blade to he clamped fast on its neck, and the novelty consists in that the laterextends at its frontcnd into a broad flange with straight smooth front surface and a dovetail-shaped projection on the latter, that is slightly tapered downwardly to engage firmly by wedgingaction with a correspondingly tapered slot in the blade of the hoe or mattock.

The accompanying drawing illustrates the improved arrangement:

Figs. 1 and 2 are respectively a side view and a front View of the neck of a hoe or mattook with inserted blade,

Fig. 3 is a front view of the detached blade, and

Fig. i is a section on the line H of Fig. 2, looking down. V

The neck a of the hole or mat-took, which at its rear end terminates in a lug Z) for its attachment to a handle extends, according to the invention, at its front end into a broad flange c with straight smooth front surface d. The latter has a dovetail-shaped lug or projection f thereon, that is slightly tapered in downward direction. Corresponding to the taper of said projection, the blade 9 of the hoe or mattock, that is detachably fixed on the neck a; has tapered slot 72, for engagement with the depressions e in the edges 0 of said projection, which slot can be open ended as shownor closed.

Said blade is firmly driven upon the neck a by wedging action when striking the said LIKE.

260,402, and in Germany January 4, 1927.

neck upside down on a firm base, its back lying then fiat upon the straight smooth front surface (5 of flange 0. .When using the hoe or mattock, its blade is continuously 40 driven fast by the blows exerted with the blade, so that it cannot get loose.

It is obvious that the improved mode of attachment can also be applied to similar implements having a detachable blade.

What I claim, is:

1. In a. hoe or mattock, the combination of a neck, a broad flange with a flat face on the front end of said neck, a projection on the front surface of said flange dovetailed in crosssection toward said face and slightly tapered downwardly, a removable. blade and a correspondingly tapered open-ended slot in said blade, the inner walls of said slot being perpendicular to the face of said blade.

2. In a tool of the type having a handle and a detachable working element extending transversely thereto, engaging means between said handle and said element, said means comprising a slot in said working element narrowing towards one end, and an end on said handle comprising a broad supporting flange having a lug thereon, said lug being shorter than said slot and correspondingly tapered longitudinally, whereby to Wedge against the sides of said slot, an d having inwardly-inclined edges whereby to clamp the working element in a direction normal to said wedging action. I

In testimony whereof I have hereunto" set my hand. i

CARL EDUARD RUGGEBERG. 

